Mudflows Resulting from the May 18, 1980, Eruption of Mount St. Helens, Washington Hydrologic Effects of the Eruptions of Mount St. Helens, Washington, 1980

Describes the location and chronology of the mudflows which followed the May 18 eruption. Average velocities are presented for the mudflows in the South and North Fork Toutle Rivers, and photographs illustrate the character of the debris and mud deposits.